Swix HF7 High Fluoro Violet Wax is a high performance glide wax for very common winter temperatures. HF7 is one of the most widely used waxes in the Cera Nova System. It is durable yet easy to iron and scrape. It makes an excellent base layer before applying Cera F FC7. And, from “7” it is easy and effective to make warmer or colder adjustments with overlayers.